<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(item,index) in list" :key="index">
            <td>{{ item.id }}</td>
            <td>{{ item.name }}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{red : item.price >= 100}"> {{ item.price }}</td>
            <td>{{ item.time | formaTime }}</td>
            <td><a href="#" @click.prevent="delFn(item.id)">删除</a></td>
          </tr>
        </tbody>
          
        <tfoot v-if="!this.list.length">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
           
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model="name"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="价格"
              v-model="price"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="addFn">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
// 引入moment包
import moment from 'moment/moment'
export default {
  data() {
    return {
      name: "", // 名称
      price: '', // 价格
      list: JSON.parse(localStorage.getItem('data')) || [],
    };
  },
  methods:{
    addFn(){
    if(this.name !== '' && this.price !== ''){
      this.list.unshift({
        id: +new Date,
        name:this.name,
        price:this.price,
        time: new Date,
      }),
        this.name = ''      
        this.price = ''
    }else{
      alert('请输入内容')
    }
    },
    delFn(id){
      this.list = this.list.filter(item => item.id !== id)
    }
  },
  watch:{
    list:{
      handler(){
        localStorage.setItem('data',JSON.stringify(this.list))
      },
      deep:true,
      immediate:true
    }
  },
  // 时间过滤器
  filters:{
    formaTime(time){
      return moment(time).format('YYYY--MM--DD HH:mm:ss')
    }
  }
};
</script>

<style >
.red{
  color: red;
}
</style>